690635867 has 4 divisors (see below), whose sum is σ = 692993280. Its totient is φ = 688278456.

The previous prime is 690635851. The next prime is 690635903. The reversal of 690635867 is 768536096.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690635867 - 2⁴ = 690635851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690637867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178267 + ... + 1178852.

It is an arithmetic number, because the mean of its divisors is an integer number (173248320).

Almost surely, 2^690635867 is an apocalyptic number.

690635867 is a deficient number, since it is larger than the sum of its proper divisors (2357413).

690635867 is a wasteful number, since it uses less digits than its factorization.

690635867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357412.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 690635867 is about 26279.9518074140. The cubic root of 690635867 is about 883.9269521037.

The spelling of 690635867 in words is "six hundred ninety million, six hundred thirty-five thousand, eight hundred sixty-seven".